高度人工化城市河道微生物优势和稀有组分扩散过程分析——以北运河为例

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Abstract Basing on the qualitative and quantitative data of microorganisms, the spatial dispersal processes of abundant and rare subcommunities were measured by the land diffusion PCNM model (principal coordinators of neighborhood matrices), the asymmetric stratified branching diffusion MEM model (Moran eigenvector map) and the unidirectional diffusion AEM model (asymmetric eigenvector map) in a heavily polluted urban river, the North Canal River. The results showed that the fitness of models of abundant subcommunities was significantly higher than that of rare subcommunities. The AEM model of abundant subcommunities had a high fitness value, while there were no significant difference in the fitness of rare subcommunities models. Comparing to the MEM model, The PCNM and AEM models explained more spatial variations of abundant and rare subcommunities. The high fitness value based on the quantitative data matrix than that of qualitative data matrix, indicating that the dispersal process was independent of environmental selection in both abundant and rare subcommunities in the highly artificial urban river. This was in line with the VPA (variation partitioning analysis) resulted that dispersal explained 18.3% and 7.4% of the variation in the abundant and rare subcommunities respectively, and environmental selection explained 18.6% and 7.6% of the variation. Abundant subcommunities showed a significant distance-decay relationship, and the synergy of environmental factors such as total nitrogen (TN) and total phosphorus (TP) were important to the diversity construction in the abundant subcommunities. These results provided theoretical and technical support for the construction mechanism of planktonic microbial diversity in the highly artificial urban river.

Key words： abundant subcommunities rare subcommunities spatial dispersal model

Received: 13 September 2022

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X172

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	ZHANG Wei
	GUO Xiao-yu
	WANG Min
	LIANG Ji
	WU Dong-li

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ZHANG Wei,GUO Xiao-yu,WANG Min等. Analysis of the dispersal process of abundant and rare subcommunities in highly artificial urban rivers: A case study of the North Canal River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 2039-2046.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/2039

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